Ch. 9

Question 1

What sand type typically cools faster

Answer 1

Green sand

Question 2

shakeout machines operate with high frequency to facilitate what

Answer 2

sand lump reduction

Question 3

what are fins

Answer 3

thin projections perpendicular to the mold that are not considered part of the casting process

Question 4

how much does cleaning make up in the total foundry process

Answer 4

25-35 %

Question 5

what causes blowholes

Answer 5

excess moisture in the mold and core

Question 6

what are blowholes

Answer 6

spherical and flattened cavities present inside the mold

Question 7

occurs when the molten metal is unable to fill the mold cavity

Answer 7

misrun

Question 8

when two metal streams do not fuse together probably. cuaisng a weak spot in the casting

Answer 8

cold shot

Question 9

Dirt is a blank defect

Answer 9

Mold related

Question 10

What causes gas related defects

Answer 10

Moisture, and chemical binders

Question 11

4 holes in casting

Answer 11

Dirt, gas, shrink, and slag.

Question 12

Slag is a blank defect

Answer 12

Pouring related

Question 13

What causes hot tear

Answer 13

Core that is not strong enough. Won’t collapse

Question 14

A cracking in the casting caused by rapid contraction after the metal solidifies

Answer 14

Hot tear

Question 15

when loose molding sands or lumps fall from the cope to the mold cavity.

Answer 15

Drop. caused by insufficient ramming

Question 16

local enlargement of a casting section defect

Answer 16

Swell. proper venting could help this problem

Question 17

when molten metal leaks out of the mold during pouring

Answer 17

Runout

Question 18

UT

Answer 18

Ultrasonic Testing

Question 19

RAM

Answer 19

Acoustic Method

Question 20

where metal or its oxide penetrates the mold giving a brittle, glassy appearance on the casting surface.

Answer 20

Fusion